<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>常见的默认样式</title>
	<style>
		*{
			margin: 0;
			padding: 0;
		}
	</style>
</head>
<body>
<div id="app">
	<div></div>
</div>

</body>
</html>